Please help, Look at the picture

The sixth grade art students are making a mosaic using tiles in the shape of right triangles.each tile has leg measures of 3 centimeters and 5 centimeters.i f there are 200 tiles in the mosaic what is the area of the mosaic.

Which expression gives the area of the triangle shown below

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles